for·ti·eth

[fawr-tee-ith]
adjective
1.
next after the thirty-ninth; being the ordinal number for 40.
2.
being one of 40 equal parts.
noun
3.
a fortieth part, especially of one ( 1 / 40 ).
4.
the fortieth member of a series.

Origin:
before 1100; Middle English fourtithe, Old English fēowertigotha. See forty, -eth

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Fortieth is always a great word to know.
So is slumgullion. Does it mean:
a stew of meat, vegetables, potatoes, etc.
a chattering or flighty, light-headed person.
Collins
World English Dictionary
fortieth (ˈfɔːtɪɪθ) [Click for IPA pronunciation guide]
 
adj
1.  a.  being the ordinal number of forty in numbering or counting order, position, time, etc. Often written: 40th
 b.  (as noun): he was the fortieth
 
n
2.  a.  one of 40 approximately equal parts of something
 b.  (as modifier): a fortieth part
3.  the fraction equal to one divided by 40 (1/40)
 
[Old English fēowertigotha]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
As a present for me on my upcoming fortieth birthday.
They also have only about a fortieth as many stars as in present-day spiral galaxies.
In this manner did he live from the fortieth or forty-second to the ninetieth year of his age.
Next week, the fortieth anniversary of the original moonwalk.
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